Tilt Up - Mercury 40 Service Manual

TILT UP

With the engine in the down position, the accumula-
tor piston (d) will be at the top of the accumulator (c)
with the gas at maximum pressure. To raise the en-
gine, the camshaft lever (f) is rotated all the way
down. The internal shaft connected to the camshaft
lever will move the push rods, opening the accumula-
tor check valve (e), both fast transfer valves (h & j)
and the down slow transfer valve (i). As the operator
lifts the engine, oil, under pressure inside the accu-
mulator, will flow around both the slow transfer valve
(i) and the down circuit fast transfer valve (h). Oil
flows into the bottom of the tilt cylinder forcing the
memory piston (m) into the shock piston (n) and then
forcing the shock rod up and out. Oil above the shock
piston exits the cylinder (l) through an interconnect-
ing passage along side of the cylinder and returns
into the manifold (g). Inside the manifold the oil flows
past the groove in the surge valve (k), through the
transfer valve (j) and mixes with the oil flowing from
the accumulator into the up cavity. With the engine in
the correct position, the camshaft lever (f) is rotated
up and the push rods allow the check valves (e, h, i,
& j) to close. The closed check valves prevent the oil
from traveling between cavities and locks the engine
into position.
90-852572R1 JANUARY 1998 MID-SECTION - 5F-5